Introduction
This manual provides comprehensive instructions for the Sonim XP3 Plus XP3900 rugged flip cellphone. It covers setup, operation, maintenance, and troubleshooting to ensure optimal performance and longevity of your device. The Sonim XP3 Plus is designed for durability and functionality in demanding environments, featuring a robust build, long battery life, and clear communication capabilities.
Product Overview

Front view of the Sonim XP3 Plus XP3900, showing the phone both open (display and keypad visible) and closed (external display visible).

Side view of the Sonim XP3 Plus XP3900, highlighting its rugged design and side buttons.

Front and back views of the Sonim XP3 Plus XP3900, showing the external display and the rear panel with battery cover.

The Sonim XP3 Plus XP3900 shown open, with a partial view of the rear panel, illustrating its flip design.
Setup
1. Charging the Battery
The Sonim XP3 Plus XP3900 comes with a 3600 mAh Lithium Ion battery. Before first use, fully charge the device using the provided Data Cable and Micro USB charger. Connect the Micro USB end to the phone's charging port and the other end to a compatible power adapter.
- A full charge enables working a full shift without recharging.
- Ensure the charging port is clean and dry before connecting the cable.
2. Installing SIM Card and MicroSD Card
To install your SIM card and an optional MicroSD card (up to 256GB), locate the battery compartment on the back of the phone. Carefully remove the battery cover and battery. Insert the SIM card into the designated slot, ensuring proper orientation. If using, insert the MicroSD card into its slot. Replace the battery and battery cover securely.
- The device supports Global LTE for connectivity.
- An expandable micro-SD card slot allows for up to 256GB of additional storage.
3. Powering On/Off
To power on the device, press and hold the Power button until the Sonim logo appears. To power off, press and hold the Power button, then select "Power off" from the options on the screen.
Operating Instructions
1. User Interface and Navigation
The Sonim XP3 Plus features a simple, intuitive user interface with three internal soft keys that dynamically change based on the display. Navigation is primarily done using the physical keypad and directional pad.
- Soft Keys: Functions displayed on the screen directly above these keys.
- External Buttons: Two new external buttons are available. One can be customized for user functions, and the other can answer, end, or mute calls, or display the call log.
- Tactile Buttons: Large, tactile, glove-friendly buttons and volume controls ensure quick, mistake-free communication.
2. Making and Receiving Calls
To make a call, enter the phone number using the keypad and press the green call button. To answer an incoming call, press the green call button or use the designated external button. To end a call, press the red end call button or the external button.
- 100 dB+ speaker and noise cancellation ensure clear communication even in noisy environments.
3. Messaging
Access the messaging application from the main menu to send and receive SMS and MMS messages. The 8.0 MP camera allows for sending picture messages.
4. Camera Functionality
The Sonim XP3 Plus XP3900 includes an 8.0 MP camera. Access the camera application to capture images or video on the go. The camera supports both front and rear modes.
5. Programmable Buttons
The device features user-programmable Emergency and Push-to-Talk (PTT) Buttons, making it easy to get help quickly or communicate efficiently. Refer to the device settings for customization options.
6. Audio Accessories
The Sonim SecureAudio 3.5mm Connector provides secure, more reliable connections with wired audio accessories. Ensure accessories are compatible with this connector type.
Maintenance
The Sonim XP3 Plus XP3900 is built to industry-leading Rugged Performance Standards, including MIL-STD-810H and Non-Incendive Class I, II and III Div 2 ratings. While designed for extreme conditions, proper maintenance ensures its longevity.
- Cleaning: Use a soft, damp cloth to clean the device. Avoid harsh chemicals or abrasive materials.
- Port Care: Keep the charging port and 3.5mm audio jack free of dust and debris.
- Battery Care: Avoid extreme temperatures when charging or storing the device.
- Software Updates: Regularly check for and install software updates to ensure optimal performance and security.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Low or depleted battery. | Charge the device for at least 30 minutes. |
| Cannot make or receive calls. | No network signal or SIM card issue. | Check network signal strength. Reinsert SIM card. Contact your carrier. |
| Audio is unclear or distorted. | Speaker/microphone obstructed or environmental noise. | Ensure speaker/microphone are clear. Move to a quieter environment. |
| Device is slow or unresponsive. | Too many applications running or low storage. | Restart the device. Close unnecessary applications. Clear cache or free up storage. |
| Camera not working. | Software glitch or camera lens obstructed. | Restart the device. Ensure camera lens is clean and unobstructed. |
Specifications
| Feature | Detail |
|---|---|
| Model Name | XP3PLus (XP3900) |
| Operating System | Android 11.0 |
| CPU Model | Snapdragon |
| CPU Speed | 2 GHz |
| Memory Storage Capacity | 16 GB (expandable up to 256GB via MicroSD) |
| RAM Memory Installed Size | 16 GB |
| Battery Power Rating | 3600 mAh Lithium Ion |
| Display Resolution | 720 x 1280 |
| Camera Features | 8.0 MP (Front, Rear) |
| Audio Jack | 3.5 mm Sonim SecureAudio Connector |
| Form Factor | Flip |
| Color | Black |
| Wireless Carrier | Unlocked |
| Cellular Technology | 4G LTE |
| Item Weight | 11.8 ounces |
| Package Dimensions | 7.44 x 4.21 x 2.09 inches |
| Included in Box | Data Cable, Micro USB |
| Rugged Standards | MIL-STD-810H, Non-Incendive Class I, II and III Div 2 ratings |
Warranty and Support
This Sonim XP3 Plus XP3900 is offered as an Amazon Renewed product. Amazon Renewed products are backed by the Amazon Renewed Guarantee. For specific details regarding your device's return policy and support, please refer to the Amazon Renewed program terms and conditions.
- Return Policy: This product is eligible for a 90-day refund/replacement return policy.
- Manufacturer: Sonim
- For further assistance: Please contact Amazon Renewed support or refer to the official Sonim support resources for product-specific inquiries.





